| 项目编号: | 1651368
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| 项目名称: | CAREER: Energetic Radical Reactions and Impact on High and Low Pressure Combustion |
| 作者: | Patrick Lynch
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| 承担单位: | University of Michigan Ann Arbor
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| 批准年: | 2017
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| 开始日期: | 2017-09-01
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| 结束日期: | 2017-08-31
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| 资助金额: | 501084
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| 资助来源: | US-NSF
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| 项目类别: | Standard Grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
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| 英文关键词: | high pressure
; low pressure
; reaction rate
; product
; pressure
; work
; energetic radical reaction
; reaction pathway
; combustion relevant temperature
; lean combustion
; hrrst
; radical reaction
; wide pressure range
; combustion temperature
; radical abstraction
; combustion device design
; low emission combustion device
; radical intermediate
; combustion system
; various radical
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| 英文摘要: | High pressure combustion is one aspect of emerging strategies for fuel efficient, low emission combustion devices. Among many advantages, high pressure permits lower temperature, lean combustion while maintaining load requirements. Many of the reaction rates and reaction pathways between fuel/oxidizer and products are uncertain at combustion temperatures and high pressure, especially for radical intermediates. These reaction rates and reaction pathways are measured using highly sensitive tools, typically at very low pressure, and are then extrapolated to high pressure. Recent theoretical predictions suggest highly energetic radical reactions can quickly pass through different pathways in low pressure conditions. Even though most combustion systems are at higher pressures, the measurements at very low pressure underpin the models of these systems, which may lead to great uncertainty in predictive models. Some of the goals of this work are to experimentally test these effects at low pressure and estimate their contribution to mechanism uncertainty at higher pressure. Another goal is to extend highly sensitive measurement techniques to high pressure. Over the course of five years, the PI will use advanced experimental and modeling tools to measure the rates and products of energetic radical reactions spanning combustion relevant temperatures and pressures. The work contributes to cleaner combustion device designs, via improved understanding of chemical reactions relevant to soot formation and high pressure pre-ignition chemistry. Information relating to the abstractions by halogens at high temperature, one aspect of the work, also contributes to fire suppression models. Additionally, efforts in this proposal include development of a combustion themed module for high school AP Physics curricula, which also incorporates pedagogic improvements through student-directed, inquiry-based investigations.
In order to test the effects of energetic pathways at low pressure, reaction rates and products of radical abstractions from hydrocarbons will be measured over wide pressure ranges. Various radicals will be employed, including halogens, in order to vary the enthalpy of reaction and the heat capacity of products at similar levels of collisional stabilization. The miniature high repetition rate shock tube (HRRST), will be used in this study. The HRRST is a tool for generating highly repeatable, highly controlled combustion conditions suitable for measurements using advanced analytical techniques. Species concentrations will be measured with a combination of tunable diode laser absorption for selected time-resolved species and mass spectrometry for products, including synchrotron sourced photoionization mass spectrometry in collaboration with researchers at Argonne National Laboratory and at the Advanced Light Source at Lawrence Berkeley National Laboratory. Reaction rates and product channels can be ascertained from these experiments with detailed chemical modeling. Besides the radical reactions which are the focus of this study, the work develops a nascent diagnostic technique, the HRRST, which can be adopted by a variety of disciplines. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/88822
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Patrick Lynch. CAREER: Energetic Radical Reactions and Impact on High and Low Pressure Combustion. 2017-01-01.
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